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SPARK PLUG
Recommended Spark Plug: BPR5ES (NGK) W16EPR-U (DENSO), or equivalent; the
recommended spark plug is the correct heat range for normal engine operating temperatures.
WARNING
Incorrect spark plugs can cause engine damage.
For good performance, the spark plug must be properly gapped and free of deposits.
1. Disconnect the cap from the spark plug, and remove any dirt from the spark plug area.
2. Use the proper size spark plug wrench to remove the spark plug.
3. Inspect the spark plug. Replace it if damaged, badly fouled, if the sealing washer is in poor
condition, or if the electrode is worn.
4. Measure the electrode gap with a suitable gauge. The correct gap is 0.028
0.031 in (0.70
0.80
mm). If adjustment is needed, correct the gap by carefully bending the side electrode.
5. Install the spark plug carefully, by hand, to avoid cross-threading.
6. After the spark plug is seated, tighten with the proper size spark plug wrench to compress the
washer.
7. When installing a new spark plug, tighten 1/2 turn after the spark plug seats to compress the
washer.
8. When reinstalling the original spark plug, tighten 1/8
1/4 turn after the spark plug seats to
compress the washer.
WARNING
A loose spark plug can become very hot and can damage the engine. Over tightening the spark
plug can damage the threads in the cylinder head.
9. Attach the spark plug cap to the spark plug.
SPARK ARRESTER (if equipped)
Cleaning and checking the spark arrester should be performed by a specialist workshop.
It requires the spark arrester maintenance after every 100 hours of operation.
SPARK PLUG
CAP
SPARK PLUG
WRENCH
SEALING
WASHER
